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City of North Olmsted 5200 Dover Center Road • North Olmsted, Ohio 44070-3129 Phone: (440) 777-8000 • Fax: (440) 777-5889 Ralph H. Bohlmann, Director Department of Public Service Paul W. Deichmann, P.E. Ciry Engineer Mr. Foster McMasters Metcalf & Eddy of Ohio, Inc. 1300 East Ninth Street, Suite 1215 Cleveland, Ohio 44144 Re: Request for a Technical and Cost Proposal (RFP): Professional Services for the 2000 Dewatering Centrifuge Project Dear 'Mr. McMasters: Norman T. Musial, iVlayor The purpose of this letter is to request five (5) copies of a Technical and Cost Proposal for providing certain professional services to the City of North Olmsted for assistance in con- tinuing the City's work on the project. The requested Technical and Cost Proposal sha11 Ue based on the contents of this letter, its attachments, and the mandatory May 23, 2000 pre- proposal meeting. Proposals wi11 be received by the City until 4:00 p.m., Wednesday, June 7, 2000. Background for the 2000 Dewatering Centrifuge Projeet The City began work on the project in early 1998: At tkat time, it became apparent that continuing to use the thermal conditioning/vacuum filtration sludge dewatering combinarion would require significantly more long term capital and operating funds than proceeding with an altemarive sludge dewatering system. Additional long tenn capital funds would be required to completely replace aud enlarge the aging thermal conditioning units and the existing Odor Group B/C unit to provide more treatment of increased thermal conditioni.ng off gases. Further, the tong teml operating funds of the enlarged equipment would be much greater than the sign.ificant cost required by the existing equipment. A dewatering centrifuge system was decided to be the best biosolids dewatering unit process for the current and future needs of the North Olmsted WWTP. This system would provide the City with the greatest long tenn flexibility while minimizing the demand for long term capital and operating funds and the volume of off gases requiring treatment. A dewatering centrifuge system would provide the flexibility to produce either unstabilized or lime stabilized biosolids. Also, a dewatering centrifuge system would provide the flexibility to quickly alternate between production of a liquid (6% to 8% solids concentration) or a sludge cake (22% to 28% solids concentration). These options are considered necessary since the ? present landfill disposal of unstabilized biosolids cake could become prohibited by any one of several regulatory programs in a relatively short rime frame. Therefore, a dewatering ? "Together We Can 1VIakeA Dif?erencz!" May 16, 2000 .-Aw-